Check-valve.



Patantad Aug. 27, I90I.

T. B. BELFIELD.

CHECK VALVE (Application med muy a1, 1901.)

No. when.

(No Modal.)

rrn Srnfrns Fries.

THOMAS BROOM BELFIELD, OF PHILADELPHIA, PENNSYLVANIA.

CH ECK-VALVE.

SPECIFICATION forming part of Letters Patent N o. 681,611, dated August 27, 1901.

Application led May 31, 1901l Serial No. 62,593. (No model.)

To @ZZ whom, it may concern,.-

Be it known that I, THOMAS BRooM BEL- FIELD, a citizen of the United States, residing in Philadelphia, Pennsylvania, have invented certain Improvements in Check-Valves, of which the following is a speciiication.

My invention relates to improvements in check-valves, and more particularly to improvements in the type of valve which is provided with means for preventing hammering or chattering when the iiuid flowing through it undergoes rapid variations of pressure or changes its direction of iiow.

In the accompanying drawings, Figure lis a side view, partly in section, showing my invention applied to an angle-valve. Fig. 2 is a sectional plan view of the same, taken on the line 2 2, Fig. l. Fig. 3 is a vertical sectional view of a portion of a check-valve, showin'g a modiiication of my invention; and Fig. 4 is a sectional plan view of Fig. 3, taken on the line 4 4 of said figure.

In constructing check-valves having a device for preventing chattering of the -valve proper it has hitherto been customary to attach a piston to the valve and to provide a cylinder or dash-pot for said piston in the top or bottom part of the valve-casing. This design has been satisfactory, except when it was desired to place an antichattering checkvalve at an angle in a system of piping or use it as an L-valve, in which case there has hitherto been no satisfactory device for such use. By myinvention I provide a structure of the above-mentioned type especially adapted for use in an angle-valve, although it will be understood that it may be used in straightway valves, if desired.

In Figs. l and 2 of the drawings, A is the casing of an angle-valve, having an inlet a and an outlet a, there being a partition a2, which divides its interior into two chambers. Suspended or supported from this partition is a cylinder as, one of the chambers of the valve-casing proper communicating with the same through a series of openings ai a4 in the sides of the cylinder. The other chamber of said casing opens into one end of the cylinder, and the edges of this opening are constructed to form a seat for a Valve b. Screwed into or formed integral with this valve is a stem or rod b', on the end of which is a piston b2, made, preferably, to loosely fit the cylinder ai. If desired, there may be a restricted opening a5 in the bottom of said cylinder, putting the space under the piston in communication with one of the chambers of the valve-casing. There is a projecting boss b3 on the valve b, having in it a recess b4, in which fits a valve-rod c, constructed to act as a guide for the valve. This rod has a handle c' on its upper end and is supported by arms or projections c2 c2 from a cover or top piece C, screwed into or bolted to the casing A. The said rod is preferably threaded at the point where it passes through the arms c2 c2, anda stufng-box c3, with a gland c4, is provided when the said-rod passes through the cover C. The boss b3 is made of such a length that after the valve has been raised from its seat the desired distance it will strike upon the under side of the Valve-cover C.

In Figs. 3 and 4 is shown a modification of the above construction, the cylinder a3 being supported by arms a a, projecting from the sides of the valve-casing, its construction otherwise being similar to that shown in Figs. l and 2.

In operation fluid entering the casing at a passes into the cylinder a3 through the openings ai, or in the modified forms'shown in Figs. 3 and 4 between the arms a as, and raises the valve b, thereby passing into the other chamber of the casing and out at a. While fluid has been flowing through the casing some of it has passed the piston b2 or come through the hole a5 into the lower part of the cylinder as the valve l) was raised. It' now a sudden cessation of flow of the Huid or a material variation of its pressure occurs, the valve b will have a tendency to return rapidly to its seat, this violent action being prevented by the body of iuid under the piston, which must be allowed to escape, either past said piston or through the opening a5, before the valve can be reseated. When it is desired to prevent the flow of fluid through the valve-casing, the rod c may be screwed down on the valve b, thereby keeping it from rising and holding it firmly toits seat.

By suspeno '1 .er `the cylinder from the partition a2 or fro..

e sides of the casing a compact strong construction of parts is se- IOO cured and one which is most advantageously applicable for use in angle-valves.

I claim as my invention- 1. In a check-valve, the combination of a casing divided by a partition into two chambers, a cylinder supported from said partition, a valve-Seated opening into said cylinder from one of said chambers, and a series of openings through the sides of the cylinder from the other chamber, with a valve fitting the seated opening and a piston xed to the valve and operating in the cylinder, and a relatively-restricted passage into the cylinder connecting the space under the piston with one of the chambers of the casing, substantially as described.

2. The combination of a casing having an inlet and an outlet and a removable cover, a

THOMAS BROOM BELFIELD.

Witnesses:

WILLIAM E. BRADLEY, Jos. H. KLEIN. 

